Jamieson, Fausset and Brown on Job 3:14

14. With kings ... which built desolate places for themselves--who built up for themselves what proved to be (not palaces, but) ruins! The wounded spirit of Job, once a great emir himself, sick of the vain struggles of mortal great men, after grandeur, contemplates the palaces of kings, now desolate heaps of ruins. His regarding the repose of death the most desirable end of the great ones of earth, wearied with heaping up perishable treasures, marks the irony that breaks out from the black clouds of melancholy [Umbreit]. The "for themselves" marks their selfishness. Michaelis explains it weakly of mausoleums, such as are found still, of stupendous proportions, in the ruins of Petra of Idumea.